Because no versions of qr_flutter match >4.0.0 and qr_flutter <1.1.2 requires SDK version >=1.8.0 <2.0.0And because qr_flutter >=1.1.2 <2.1.0+55 depends on qr ^1.0.0, qr_flutter <2.1.0+55 or >4.0.0 requiresqr ^1.0.0.And be
code = vehicle.qr_code.value 但是这段代码构建的查询是 SELECT "qr_codes".* FROM "qr_codes" WHERE "qr_codes"."codeable_id" = $1 AND "qr_codes".""qr_codes"."codeable_id" = $1 AND "